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Document Number: 34727 Rev. 1.0, 5/2008 Freescale Semiconductor Advance Information * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2008. All rights reserved. 600mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode The 34727 is a high efficiency, low quiescent current (IQ), synchronous buck regulator, implementing Freescale’s innovative Z-mode architecture. Freescale’s Z-mode architecture greatly improves the ripple performance during light load currents, but still maintains a low quiescent current of 65 µA, at no load in “Sleepy” Z- mode. The 34727 accepts an input voltage in the range of 2.7 to 5.5V, making it ideally suited for single cell Li-Ion based applications. Factory preset output voltages, ranging from 0.8 to 3.3V, reduce the number of required auxiliary components. The part is able to provide 600mA of continuous load current across the input and the output voltage ranges. The 34727 switches at 2.0MHz to allow the use of small surface mount inductors and capacitors, to save precious board space. The 34727 is available in the small, space saving, and low cost, 2x2 UDFN-8 packages. The part is guaranteed for operation over the -25°C to +85°C temperature range. Features • 94% peak efficiency • 2.0MHz switching frequency • Automatic transition to energy saving light load Z-mode (low ripple) • 2.7V to 5.5V input voltage range • Fixed output voltage options from 0.8V to 3.3V •65 µA quiescent current during sleepy Z-mode • 600mA maximum continuous output current • Internal 2.0ms soft start • Thermal and over-current protection •0.1 µA quiescent current in shutdown (disabled) • Ultra thin 2x2 UDFN package • Pb-free packaging designated by suffix code FC Figure 1. 34727 Typical Operating Circuit POWER MANAGEMENT IC FC SUFFIX (PB-FREE) 98ASA10787D 8-PIN UDFN 2X2 34727 ORDERING INFORMATION Device Temperature Range (TA) Package MC34727AFC/R2 -25°C to 85°C 8-UDFN MC34727BFC/R2 MC34727CFC/R2 Bottom View VIN EN SW FB GND ON OFF 2.7V ~ 5.5V 0.8 - 3.3V * 600mA 34727 CIN COUT L1 *Programmable See table 1 |
